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It takes 164.8 Earth years for Neptune to orbit the sun.

Neptune is the second largest gravity planet.  Jupiter is the biggest.

It is the smallest of the ice giants. Uranus is the biggest ice giant.

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Some people say Galileo discovered Neptune in 1613.  Other people think Neptune was discovered in 1846.

Neptune was the first planet discovered by mathematical prediction.

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Even though there is water and gravity like Earth, Neptune is a gas planet. It does not have a rocky crust for humans to walk on. Humans could not live on Neptune.

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Neptune has 14 moons. The biggest moon is called Triton. It orbits in retrograde, which means it goes backwards.

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Neptune has an internal heat source, but it is -353 degrees Fahrenheit.

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Neptune is a gas planet. It is made up of mostly Hydrogen and Helium. Neptune has high winds and really big, violent storms.

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Neptune turns on its own axis as it orbits the sun.

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Neptune's gravity is like Earth's.

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Neptune has 17 times the mass of Earth and it 30,775 miles in diameter.

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Neptune spins faster than the Earth. If takes just over 19 hours to make a full rotation.

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Neptune is the farthest from the sun. It is 2.8 billion miles away.

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Neptune is named for the Roman god of the Sea.